$compressedFileName = 'download'.mktime().'.zip';
$currentFolderPath = '/data/';
$compressedFileLocation = '/tmp/'.$compressedFileName;
 
foreach ($files as $file) {
	$files_to_be_compressed[] = '"'.$file->getFileName().'"';
}
 
chdir($currentFolderPath);
 
if (count($files_to_be_compressed)) {
	$command = "zip $compressedFileName " . implode(' ', $files_to_be_compressed);
shell_exec($command);
 
//move the tar file to temp folder so that we can easily remove all the temp tar files with cron
	$command = "mv $compressedFileName $compressedFileLocation";
	shell_exec($command);
}
 
if (file_exists($compressedFileLocation))
{
	//disable the default layout because we want to present a file
	$this->_helper->viewRenderer->setNoRender();
 
	$documentMime = $docmans->mime_content_type($compressedFileLocation);
 
	// Since everything is correct, send the file then!
	header('Content-Description: File Transfer');
	header("Content-Type: $documentMime");
	header("Content-Length: ".filesize($compressedFileLocation));
	header("Content-Disposition: attachment; filename=\"$compressedFileName\"");
	header('Content-Transfer-Encoding: binary');
	header('Expires: 0');
	header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
	header('Pragma: public');
	readfile($compressedFileLocation);
	exit();
}